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[MAPREDUCE-5323] Min Spills For Combine Ignored - MapReduce - [issue]
...We've observed for some time that combiners always run when specified. However there is a config called mapreduce.map.combine.minspills which sort of implies that the developer or administra...
http://issues.apache.org/jira/browse/MAPREDUCE-5323    Author: Jeff Bean, 2013-06-15, 00:43
Re: Job Tracker & TaskTracker logs location Understaning - MapReduce - [mail # user]
...Give this a read, and let me know if there are still questions:  http://blog.cloudera.com/blog/2009/09/apache-hadoop-log-files-where-to-find-them-in-cdh-and-what-info-they-contain/ &nbs...
   Author: Jeff Bean, 2013-01-28, 18:10
Re: Query: Hadoop's threat to Informatica - HDFS - [mail # user]
...Informatica's take on the question:  http://www.informatica.com/hadoop/  My take on the question:  Hadoop is definitely disruptive and there have been times where we've been a...
   Author: Jeff Bean, 2013-01-18, 14:12
[expand - 1 more] - Re: Fair Scheduler is not Fair why? - HDFS - [mail # user]
...Hi Dhanasekaran,  The issue is not with Hadoop streaming. You can try this yourself:  On your local disk, touch a bunch of files, like this:  mkdir stream cd stream touch 1 2 ...
   Author: Jeff Bean, 2013-01-17, 18:35
Re: A simple question - how to understand version number in "Hadoop-0.20.2+923.421" ? - HDFS - [mail # user]
...This is a Cloudera release level.  Specifically, it's CDH3, update 5. It means we've taken hadoop-0.20.2, added 923 additional patches during beta for CDH3, 421 patches applied after th...
   Author: Jeff Bean, 2013-01-16, 17:47
[expand - 1 more] - Re: When reduce tasks start in MapReduce Streaming? - MapReduce - [mail # user]
...It's called Hadoop Streaming because keys and values are streamed in to stdin of the script you specify for Hadoop Streaming and then captured via stdout.  On Wed, Jan 16, 2013 at 1:04 ...
   Author: Jeff Bean, 2013-01-16, 09:20
Re: Lost tasktracker errors - Hadoop - [mail # general]
...Hi,  I think this issue looks like the jobtracker is running out of RAM, too. "Lost task tracker" is indicative of what I call the "million mapper march". Lots of tasks running per user...
   Author: Jeff Bean, 2013-01-07, 21:03
Re: Region Servers Issue - HBase - [mail # user]
...Hi Dalia,  If all the regions are still on the first server you don't get the benefit of the second server. Try running the hbase balancer after adding the second server. Then check to ...
   Author: Jeff Bean, 2013-01-02, 18:42
Re: Profiler in Hadoop MapReduce - MapReduce - [mail # user]
...Hi Pedro,  Have you read the documentation on profiling MapReduce?  http://hadoop.apache.org/docs/r0.20.2/mapred_tutorial.html#Profiling  Jeff  On Sat, Dec 15, 2012 at 7:...
   Author: Jeff Bean, 2012-12-30, 18:23
[MAPREDUCE-2836] Provide option to fail jobs when submitted to non-existent pools. - MapReduce - [issue]
...In some environments, it might be desirable to explicitly specify the fair scheduler pools and to explicitly fail jobs that are not submitted to any of the pools. Current behavior of the fai...
http://issues.apache.org/jira/browse/MAPREDUCE-2836    Author: Jeff Bean, 2012-03-28, 09:12
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB